Linearity coil



FIG. 1 is a left side view of the linearity coil forming our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is perspective view thereof. 

The ornamental design for a linearity coil, as shown and described. 